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Goswami, Bapi
- A Note on Seismic Evidences during the Sedimentation of Panchet formation, Damodar Basin, Eastern India: Banspetali Nullah Revisited
Abstract Views :181 |
PDF Views:2
Authors
Abhik Kundu
1,
Bapi Goswami
2
Affiliations
1 Asutosh College, 92 S P Mukherjee Road, Kolkata-700026, IN
2 J K College, Purulia-723101, IN
1 Asutosh College, 92 S P Mukherjee Road, Kolkata-700026, IN
2 J K College, Purulia-723101, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 3 (2008), Pagination: 400-404Abstract
The Damodar basin of eastern India preserves both Lower and Upper Gondwana sediments. It was thought earlier that deposition of Panchet Formation ot Upper Gondwana took place in a tectonitally undisturbed condition. However present study reveals that some beds of Panchet Formation were seismically disturbed as they contain several horizons of soft sediment deformation structures like deformed cross beds, convolute laminae, mud dykes flame structures, pseudonodules chaotic bedding and drifted sediment blocks. The preservation of these penecontemporaneous deformation structures clearly suggests that earthquakes were responsible for the deformation and warrants further study on the tectonic history of the basin.Keywords
Panchet Formation, Seismites, Soft Sediment, Deformation Structures, Damodar Basin.
- Magmatic Epidote in the Grenvillian Granitoids of North Purulia Shear Zone, Chhotanagpur Gneissic Complex, India and its Significance
Abstract Views :181 |
PDF Views:73
Authors
Affiliations
1 Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700 019, IN
1 Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700 019, IN
Source
Current Science, Vol 117, No 2 (2019), Pagination: 298-303Abstract
Magmatic epidotes of granitoid pluton from North Purulia Shear Zone, eastern India, are identified by textural and chemical criteria. The accessory sphene, epidote, allanite and magnetite in the granitoid indicate high fO2 during crystallization. Hornblendes were crystallized between 1.2 and 4.8 kbar, 753°C and 783°C as well as high fO2 (>Ni–NiO buffer). Preservation of magmatic epidote in pluton emplaced at low pressure is due to rapid magma ascent (>3.1 km/year). Fast upward transportation of parental magma of the pluton took place through extensional voids along the regional shear zone.Keywords
Granitoids, Magmatic Epidote, Oxygen Fugacity, Shear Zone Emplacement.Full Text
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